The Koto'Amatsukami is an ocular genjutsu said to be unique to the Kaleidoscope Sharingan of Shisui Uchiha. A widely known trait of this genjutsu is the ability control individuals without them noticing.[3] This genjutsu exhausts the user's Kaleidoscope Sharingan, causing it to regress into a Sharingan, for a period of 10 years.[4] Though it is unclear how this distinction was discovered, this period can shortened if the user possesses the chakra of the Shodaime Hokage, Hashirama Senju.[5]

Shisui was famous because of this ocular genjutsu, at times called the most talented member of the Uchiha clan. He attempted to use this ocular genjutsu to sway the Uchiha clan into cancelling their plans to usurp the leadership of Konohagakure, but his left eye was stolen by Danzo Shimura.[6] Shisui later entrusted his right eye to his best friend Itachi Uchiha, who would later implant the eye into a crow. He would later gave the crow to Naruto Uzumaki, as a last resort to manipulate his brother Sasuke Uchiha into returning to Konohagakure.[7][8]

However, when Itachi faced Naruto in battle, he deliberately activated his Kaleidoscope Sharingan to trigger the crow use Shisui's ocular genjutsu, freeing him from the control of Kabuto's Edo Tensei ninjutsu.[9][10] Itachi would later destroy the crow, on the grounds that the crow is no longer useful to Naruto, and that his will is a greater weapon against Sasuke.[11]